Is this a feral cat colony? Are they being cared for? Are their ears tipped, which is a sign that they have been trapped, neutered and returned to their territory? If not, this "situation" needs to be handled by a cat rescue. TNR is a very effective way of controlling feral colonies because if left unattended, they will continue to breed. Contact the UCSPCA and ask them to help. If I lived in Kingston, I would help with the TNR but I am not in the area. There is also a cat rescue called Project Cat, maybe they can help or know of someone that can. These poor cats were probably dumped by irresponsible people and left to fend for themselves. Its a sad, cruel world we live in and people need to take responsibility for their actions. Cats are innocent, loving creatures and don't deserve this sort of fate.